RE: [platform-swt-dev] Re: Subclassing Shell

[Steve Northover <Steve_Northover@xxxxxxxxxx>]

Also known as a helper.  <g>

"Jeff Brown" <j9brown@xxxxxxxxxxxxxxxxx> Sent by: platform-swt-dev-admin@xxxxxxxxxxx 01/09/2004 12:59 AM Please respond to platform-swt-dev

To:        <platform-swt-dev@xxxxxxxxxxx>         cc:                 Subject:        RE: [platform-swt-dev] Re: Subclassing Shell

Try a factory method perhaps.

> -----Original Message-----
> From: platform-swt-dev-admin@xxxxxxxxxxx 
> [mailto:platform-swt-dev-admin@xxxxxxxxxxx] On Behalf Of 
> Markus Enzenberger
> Sent: January 8, 2004 1:02 PM
> To: platform-swt-dev@xxxxxxxxxxx
> Subject: [platform-swt-dev] Re: Subclassing Shell
> 
> 
> On Thu, 8 Jan 2004, Steve Northover wrote:
> 
> > To really answer this question, you need to describe the cases
that
> make 
> > sense to you.
> 
> for instance, I want to ensure that all my windows get the same 
> application icon, so I make a base class, that derives from 
> Shell and sets the image in the constructor.
> >From a OO design point of view, there is nothing wrong with that.
> The subclass clearly has a is-a relationship with Shell and since
I 
> don't want to make any more assumptions about the derived classes,
a 
> wrapper class would be not good, essentially instead of 
> inheriting the 
> whole Shell API, I would have to wrap a huge amount of functions.
> 
> > The technical reaons are that the Shell class was not
> > designed to be subclassed and is different on different platforms.
> 
> the implementation of Shell is different on different 
> platforms, but not 
> the API. And the implementation (whether it uses Java or JNI) is 
> encapsulated in a class.
> with technical reasons I mean any other reasons than whether 
> it is good 
> or bad software design. Is it a bug if I create a sublass of 
> Shell? How could something break or be platform-dependent?
> 
> Thanks
> 
> - Markus
> 
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